Chapter 2 - P&ID’S, Symbols, Piping Specifications and Line Lists

As was indicated in Chapter 1, the Piping and Instrumentation Diagram is the road map for completing Piping Layout/Arrangement Drawings. The Piping and Instrumentation Diagram (P&ID) is developed from the Process Flow Diagram (PFD) and is a schematic drawing representing the process equipment, showing nozzles, all pipes and in-line fittings (valves, tees, reducers, strainers, sight glasses, drains, vents, sample points, control valves etc.), instruments and control loops (but not instrument piping), and some electrical data such as tracing and motor drives.
Larger plants will have a separate Utility Diagram which shows all utility lines servicing process lines and equipment. Utility lines would consist of steam, condensate, water, air and possibly inert gas etc. In a small plant all process and utility piping would be included in the P&ID





Above is only an excerpt from the chapters of the book: Detail Engineering and Layout of Piping Systems 5th Edition.
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